More Problems

• Write a program to check if a string is a valid binary search tree representation.
• Write a program to find the longest common prefix among multiple strings.
• Write a program to implement the heap sort algorithm.
• Write a program to check if a number is a Fibonacci number using recursion.
• Write a program to find the total number of unique paths in a 2D grid with obstacles.
• Write a program to implement a basic online multiplayer game.
• Write a program to check if a string can be rearranged to form a palindrome.
• Write a program to find the first unique character in a string using a frequency map.